You should be able to filter stuff in trash that you want to keep, though it might be a more methodical process. If you know certain things you always delete -- for example, I receive coupons and stuff from a few vendors -- you can filter those out using in:trash from:johndoe@example.com and permanently delete them. Then, select all (and I do mean all of them) and then restore. That's one option, but it will be time-consuming.
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AarthiApr 8 '12 at 14:48

I think that this is the only real solution. I wish there were some 'undo' function I could use... I just restored everything to my inbox and started archiving/trashing stuff again :-(
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Zach LApr 8 '12 at 18:14

1 Answer
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Gmail shows a preview of the messages that the filter will apply to during the filter setup I'd encourage you to review the results in the future to make sure they are what you expect. Unfortunately at this time it is not possible to revert a filter after creation, but I'm passing along your feedback. If you haven't already, make sure to delete that filter from your Settings to prevent it from catching any new incoming messages.